PNG ICO ICNS MORE
Mixed
Glyph
Retina Display Icons
outbox
Silver
64x64
PNG MORE
Pixel
IconSweets 2
Biu, inbox, outbox
Black
40x40
inbox, mail, outbox
buy, Basket, shopping
Business & finance
Smooth
Primo
DarkGray
128x128
Computer & hardware
3D
Human o2
inbox, read, mail
WhiteSmoke
Crystal Project
outbox, paper plane
256x256
UI
Gnome icons
48x48
Photography & graphic design
Dark Glass
outbox, Folder
DarkSlateGray
outbox, Email, Folder
Nuvola
Sienna
16x16
Crystal Clear